Evidence In The Rocks Flashcards
1
Q
what do rounded grains show
A
that the sediments must have been transported for a long time because abrasion has smoothed them
2
Q
what do sharp-edged grains show
A
that the grains were probably not transported for very long
3
Q
what do small grains show
A
that the grains were deposited by the wind (which can only move very small particles)
4
Q
what do rocks with large grains or mixed grain sizes (such as conglomerate)
A
that the grains must have been deposited by fast-moving water
5
Q
what do layers in the rock show
A
that the river that deposited them changed speed time by time.
